ID21 Kohzu monochomator

General description

In the high energy mode (2-9keV), a fixed exit double crystal monochromator (DCM) from Kohzu is used as shown in the image above. This monochromator can be used with a variety of monochromating optics but is operating initially with two Si<111> crystals for requiring high energy resolution (~10^-4). Si<220> crystals are also available. In addition, the use of NiB4C multilayer optics facilitates experiments requiring higher flux and moderate energy resolution (10^-2-10^-3).

This fixed exit monochromator allows "easy" energy scanning with very little exit beam movement or loss of parallelism. In order to minimize the effect of any residual beam movement during the energy scan, the device is positioned as close as possible to the SXM in the experimental cabin. This monochromator can be used either in focussed or unfocussed beam conditions upstream of the zone plate focussing.